In 2007,i was lucky enough to be the only one selected from our group to go abroad . i ___ (study)
题目
In 2007,i was lucky enough to be the only one selected from our group to go abroad . i ___ (study)
there for four years and finally returned to Nanjing .
请问这里可以使用过去完成进行时吗?还可以用什么时态?望给以详细解答,谢谢!
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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